Digital signal coding and decoding
AssigneeCanon Kabushiki Kaisha
InventorFelix Henry
Life of this patent
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Abstract
The invention concerns a method of coding a set of coefficients representing physical quantities, characterized in that it includes the steps of: selecting (E4), for each coefficient to be coded, a first or second coding mode according to a coding cost, the first coding mode including the calculation of an amplitude model, and the determination of a path (P) amongst the coefficients, coding (E5) the length of the path, coding (E6) the coefficients for which the first coding mode has been selected, by the first coding mode, coding (E7) the coefficients for which the second coding mode has been selected, by the second coding mode.
Claims25
Method of coding a set of coefficients representing physical quantities,
- characterized in that it includes the steps of:
- selecting (E4), for each coefficient to be coded, a first or second coding mode according to a coding cost, the first coding mode including the calculation of an amplitude model, and the determination of a path (P) amongst the coefficients,
- coding (E5) the length of the path,
- coding (E6) the coefficients for which the first coding mode has been selected, by the first coding mode,
- coding (E7) the coefficients for which the second coding mode has been selected, by the second coding mode.
Device for coding a set of coefficients representing physical quantities,
- characterized in that it has:
- means (20) for selecting, for each coefficient to be coded, a first or second coding mode according to a coding cost, the first coding mode including the calculation of an amplitude model, and the determination of a path amongst the coefficients,
- means (21) for coding the length of the path,
- means (22) for coding the coefficients for which the first coding mode has been selected, by the first coding mode,
- means (23) for coding the coefficients for which the second coding mode has been selected, by the second coding mode.
Dependencies are inferred from the claim text.